Blast-furnace twyer.



W `TN ssEs I m r w A No. 826,715. PATENTBD JULY-24, 190s.

"T, EVANS. BLAST PURNACBTWYER. APPLIOATIOFIJED DEU. 22. 1905. l

2 SHEETS-'SHEET 2.

` ments attached to a furnace.

^ enlarged view the twyer is c THOMAS EVANS, or GREAT FALLS, MONTANA.

BLAST-FURNAGE TWYER. '4

are. seems.

Speccation of Letters Patent.

Patented July 24, 1%?06.

Application filed December 22, 1905. Serial No. 298,034

To ai?, whom t may concern:

Be it known that l, THOMAS EvANs, a resident oi" Falls, in the county ofCascade and State or` Montana, have invented certain new and usefulimprovements in Blast-Furnace "lwyers; and l do hereby declare thefollowing to be a'ull, clear, and exact description of the invention,such as will enable others skilled in the art to which it apper- 'tainsto make and use the same.

My invention relates to improvements in blast-'furnace twyers, theobject of the invention vlacing to provide an improved air-tight twyerwith Vautomatic valve to close the much-rod opening in the end thereof'and not interfere with the insertion or withdraw al of the rod, provideimproved means for preventing any molten metal which mightQentcr thetwyer 'from reaching the valve, and resulting in a twycr which reducesleakage of air to the minimum, thus rendermg the operation of thefurnace economical and at the Sametime, greatly reduces the necessitylor close attention to the furnace.

With these and other objects in view the invention consists in certainnov el lfeatures of construction and combinations and arrangements ofparts, as will be more fully here'- ina'liter described, and pointed out1n the claims.

ln the accompanying drawings, Figure 1 is a view in section,illustrating my improve- Fig. 2 is an in section of the twyer removed.Fig. 3 is a view of the cap removed, and Figs. 4, 5, 6, and 7 are viewsof various details oi' construction.

1 represents a blast-furnace, and 2 my 'improved twyers secured to thefurnace and irovidcd with air-blast tubes apparatus. The outer end oflcsed by an air-tight cap 3,

annular flange 4 to receive the twyer end and be secured thereto by abayonet or cam joint, and a dovetailed circular groove is made in thecap to receive a packing 4a, of asbestos or other suitable material., tobear against the end of the twyer and provide a perfect air-tight jointbetween the cap and twyer.

The cap is made with a central opening or sleeve 5 to receive a brass orother bushing 6, driven tightly therein. This bushing 6 has acylindrical bore or punch-hole 7, made flared at its inner end to form avalve-seat for a valve 8, which latter is secured upon a link 9,

with any blast which latter has an hinged at its upper end to the cap asshown, and permits the valve to swing upward out of the way when thepunch-rod is inserted and automatically falls and is held' tightlyclosed b the pressure of air remove from the twyer. ed opening is madeto receive a tubular plug 10, internally screw-threaded and made with aninternal shoulder 11, against which a disk 12, of lead or other fusiblemetal, is held by a tubular plug 13, screwed into the plug 10.

In the operation of blast-furnaces" a quantity of metallic crust formson the inner surface of the furnace, which when an intense blast of airis supplied melts and runs down the sides of the furnace into thetwyers. Should this occur with my improved twyers, the molten metal willmelt the lead disks 12 `and run out the opening thus provided withoutcoming into contact with the valve. The operator serves the molten metalrunning out the bottom of the twyer immediately shuts ofi the blasttothat twyerand plugs the same with clay. He then puts in a new leadpunches out the clay, and turns on the blast, phen the twyer is readyfor operation as beore.

Slight changes might be made in the ge eral form and arrangement of thepartsde# scribed without departingfrom In invention, and hence l do notrestrict mysel to the irecise details set forth,- but consider myse atliberty to make such slight changes and alterations as fairly fallwithin the spirit and scope of my invention. y

Having fully described my invention, what l claim as new, and desire tosecure by Le f ters Patent, is

1. A twyer for blast-furnaces constructed with an opening in its bottom,a destructible disk normallyl closing said opening, a removable capclosingr the outer end of the twyer, said cap having an opening, and avalve pivotally attached to the inside of the removable 2. Thecombination with a twyer, of a removable cap thereon having a circulargroove, packing in said groove to bear against the end of the twyer,tion with the inside of the cap, able bushing in the cap constitutingthe punch-rod hole the inner end of said bushing forming a seat for saidvalve. Y

3. The combination with a and a remov- When he ob-v o when the rod 1s lIn the bottom of the twyer a screw-threadl to the furnace, often A disk12,

a valve having a hinged connectwyerl having ,fi-ign' opening in itsbottom, *ofV a removable cap 'the inner side of said removable cap andnorn 'secnred air-tight to the outer end of the twyer, mally closing theoke-ho1ea hinged valve connected With the inside of In testimouyw ereofI have signed this the cap and closing'a, punch-rod hole thei'ein,-specicetion in the presence of two subscriband Ineens for securing alead disk in the ing Witnesses.

opening in the bottomof the twyer. THOMAS EVANS. n 4. A twyer providedat its rear end with e Witnesses: removable cap having V.a poke-holetherein O. C. PRoeToR,

and a. valve having a hinged connection with J. A. WRIGHT.'

